Docs/LoongArch: Add advanced extended IRQ model

Introduce a new advanced extended interrupt model with redirect interrupt
controllers. When the redirect interrupt controller is enabled, the routing
target of MSI interrupts is no longer a specific CPU and vector number, but
a specific redirect entry. The actual CPU and vector number used are
described by the redirect entry.

Signed-off-by: Tianyang Zhang <zhangtianyang@loongson.cn>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://patch.msgid.link/20260513012839.2856463-2-zhangtianyang@loongson.cn

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